Castrol Power 1 Racing 4T is a fully synthetic engine oil for modern, high performance 4-stroke bikes. Castrol POWER1 Racing 4T is specifically designed for bikers who love the exhilaration of riding on the limit. Riding hard puts the bike under a lot of stress leading to higher frictional losses. Castrol POWER1 Racing 4T fully synthetic oil, with Race Derived Technology™ is proven to stay strong and deliver acceleration in race track conditions. It has been tested and proven to deliver exceptional acceleration and power at the touch of the throttle.